So, obviously, I'm new to the Mac - just received a 2011 MacBook Pro today. And what better way to learn how to use it than to start clicking things to see what happens? Actually, not always a good idea, hence my issue: I used to see my networked external hard drive listed in the Documents window, but the drive name had an odd icon to the right of it, so I clicked it and then my external drive disappeared from the list. Now I don't know how to access it. I've searched on my Mac & the Interwebs, but no luck so far. Any help would be much appreciated.

You're right, it was the eject icon. Turns out a reboot resulted in reconnecting. But surely there's a way to manually remount the drive without running that app you referenced, right? (Or is that just the PC in me talking?)